Creating New Code Combination ID in Custom Form Returns -1 (Urgent)

Hi All,
I used the following API to create the code combinations in a Inventory custom form.
>
>    SELECT CHART_OF_ACCOUNTS_ID INTO :PARAMETER.CHART_OF_ACCOUNTS_ID
>    FROM ORG_ORGANIZATION_DEFINITIONS
>    WHERE ORGANIZATION_ID = :PARAMETER.ORG_ID;
>
>         FND_KEY_FLEX.DEFINE(
>         BLOCK => 'XX_MRN_TRX_HEADERS',
>          FIELD => 'TO_ACCOUNT',
>          CODE => 'GL#',
>          APPL_SHORT_NAME =>'SQLGL',
>          NUM => ':PARAMETER.CHART_OF_ACCOUNTS_ID',
>          ID => 'TO_ACCOUNT_ID',
>          VRULE => '\\nSUMMARY_FLAG\\nI\\nAPPL=SQLGL;NAME=GL_NO_PARENT_SEGMENT_ALLOWED\\nN\\0GL_GLOBAL\\nDETAIL_POSTING_ALLOWED\\nE\\nAPPL=INV;NAME=INV_VRULE_POSTING\\nN',
>      REQUIRED => 'N',
>      DINSERT  => 'Y',
>          VALIDATE => 'FULL',